Knife



Nov. 30 19-26.

G. B. EFANTIS KNIFE Filed Oct. 19, 1925 INVEN'I OR GiZiEfazztis BY M ATTORNEYS Patented Nov. 36, 1926.

UNITE STATES GEORGE B. EFANTIS, OF I-IINSDALE, ILLINOIS.

KNIFE.

Application filed October 19. 1&25.

My invention relates to improvements in knives, and it consists in the combinations, constructions, and arrangements herein de scribed and claimed.

An object of my invention is to provide a knife of the character described in which the blade may be removed and replaced upon the handle with ease, whereby a number of blades or instruments, such as employed by surgeons or dentists and the like, may be selectively supported upon a common handle member.

One of the important advantages attained by the use of a knife or instrument constructed in accordance with my invention is that the person using the knife or instrument may always use the same handle memher by means of which the blades or instruments are supported, and thus become thoroughly accustomed to the feeling of this member so that greater confidence in the use of the blades or instruments may be expected.

A further object of the invention is to pro vide a knife of the character described which is simple in construction, which is durable, and which is thoroughly practical commercially.

Other objects and advantages will appear in the following specification, and the novel features of the invention will be particularly pointed out in the appended claim.

My invention is illustrated in the accompanying drawings, forming part of this application, in which Figure 1 is abottom plan view of an embodiment of my invention,

Figure 2 is a sectional view along the line 22 of Figure 1, and

Figure 3 is a view of the device illustrated in Figure 1, with the blade partially removed from the handle.

In carrying out my invention I make use of a handle member 1 constructed of nickeled steel. The handle member 1 is provided with a deep narrow groove 2 at the outer end thereof and on the under side of the handle.

A steel pin 3 is projected transversel through the handle member 1 at a point ad j went to the innermost end of the groove 2 and near the lower edge of the handle, substantially as shown in Figures 2 and 3.

A steel blade 4 is provided which has a Serial No. 63,444.

narrow depending portion 5 arranged for disposition between the pin 3 and the wall 6 of the groove 2. The blade 4 is provided with that portion arranged for projection within the groove 2 with a flat upper edge 7 which is arranged to abut a straight wall 8 at the innermost part of the groove 2.

The blade 4 is further provided with an overhanging portion 9 at the outermost end of the portion 7, which portion 9 is arranged to overlie the outermostend 10 of the handle 1. It will be noted that the overhanginrr portion 9 and wall 10 are slightly inclined? as shown in Figures 2 and 3, so as to further assure against unintentional dislodgment of the blade from the handle. The cutting edge of the blade is shown at 11.

From the foregoing description of the various parts of the device, the operation thereof may be readily understood. In in serting the blade 4, or other similar instrument, having its inner end fashioned to conform to the contour illustrated in Figures 2 and 3, I first place the blade or instrument in the position shown in Figure 3 with the portion 5 received within the groove 2. I then rotate the blade in a counter-clockwise direction until it assumes the position shown in Figure 2 with the overhanging portion 9 engaged with the portion 10 of the handle, and the portion 5 tlghtly pressed against the pin 3.

The position of the blade or instrument is now such as to Withstand any pressure exerted upon the cutting edge 11 which will tend to rotate the blade in a counter-clockwise direction. In order to disengage the blade or instrument, it is merely necessary to move the blade in a clockwise direction with respect to the handle member to the position shown in Figure 3, whereupon the blade or instrument will fall free of the handle.

I claim:

A device of the character described, comprising a handle member having a narrow longitudinal groove extending inwardly from one end of the handle along the lower edge thereof, a pin carried by the handle and projected transversely across the groove, a work-engaging member having a portion fashioned to enter the groove between the in and the upper wall of the groove and eing provided with a bevelled edge arranged to bear upon the pin, said Workengaging member having a second bevelled edge on its upper side, said bevelled edges being angularly disposed with respect to one another, and the end of the handle adj acent the groove having a bevelled surface arranged to be engaged by the bevelled portion on the upper edge of the handle, where by the Work-engaging member is wedged to the handle by pressure exerted through the 10 Work-engaging member in normal use, and

which may be quickly detached from the handle by force in the opposite direction.

GEORGE B. EFANTIS. 

